Dietary variations in three co-occurring rockfish species off the Pacific Northwest during anomalous oceanographic events in 1998 and 1999
Stomach samples from three rockfish species, yellowtail(Sebastes f lavidus), widow (S. entomelas), and canary (S. pinniger) rockfish, seasonally collected off the Pacific Northwest in 1998 and 1999, provided quantitative information on the food habits of these species during and after the 1997–98 El Niño event. Although euphausiids were the most common major prey of all three predators, gelatinous zooplankton and fishes were the most commonlyconsumed prey items during some seasonal quarters. The influence of the El Niño event was evident in the diets. Anomalous prey items, including the southern euphausiid species Nyctiphanes simplex and juveniles of Pacific whiting (Merluccius productus) frequently appeared in the diets in the spring and summer of 1998. The results of stomach contents analyses, based on 905 stomach samples from 49 trawl hauls during seven commercial fishing trips and from 56 stations during research surveys, were consistent with the timing of occurrence and the magnitude of change in biomass of some zooplankton species reportedfrom zooplankton studies in the northern California Current during the 1997–98 El Niño. Our findings indicate that the observed variations of prey groups in some rockfish dietsmay be a function of prey variability related to climate and environment changes.
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Language: | English |
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2009
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Subjects: | Biology, Ecology, Fisheries, |
Online Access: | http://hdl.handle.net/1834/25430 |
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dig-aquadocs-1834-254302021-06-27T02:15:45Z Dietary variations in three co-occurring rockfish species off the Pacific Northwest during anomalous oceanographic events in 1998 and 1999 Lee, Yong-Woo Sampson, David B. Biology Ecology Fisheries Stomach samples from three rockfish species, yellowtail(Sebastes f lavidus), widow (S. entomelas), and canary (S. pinniger) rockfish, seasonally collected off the Pacific Northwest in 1998 and 1999, provided quantitative information on the food habits of these species during and after the 1997–98 El Niño event. Although euphausiids were the most common major prey of all three predators, gelatinous zooplankton and fishes were the most commonlyconsumed prey items during some seasonal quarters. The influence of the El Niño event was evident in the diets. Anomalous prey items, including the southern euphausiid species Nyctiphanes simplex and juveniles of Pacific whiting (Merluccius productus) frequently appeared in the diets in the spring and summer of 1998. The results of stomach contents analyses, based on 905 stomach samples from 49 trawl hauls during seven commercial fishing trips and from 56 stations during research surveys, were consistent with the timing of occurrence and the magnitude of change in biomass of some zooplankton species reportedfrom zooplankton studies in the northern California Current during the 1997–98 El Niño. Our findings indicate that the observed variations of prey groups in some rockfish dietsmay be a function of prey variability related to climate and environment changes. 2021-06-24T16:20:17Z 2021-06-24T16:20:17Z 2009 article TRUE 0090-0656 http://hdl.handle.net/1834/25430 en http://fishbull.noaa.gov/1074/lee.pdf application/pdf application/pdf 510-522 http://aquaticcommons.org/id/eprint/8781 403 2012-06-10 08:59:49 8781 United States National Marine Fisheries Service |
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Biology Ecology Fisheries Biology Ecology Fisheries Lee, Yong-Woo Sampson, David B. Dietary variations in three co-occurring rockfish species off the Pacific Northwest during anomalous oceanographic events in 1998 and 1999 |
description |
Stomach samples from three rockfish species, yellowtail(Sebastes f lavidus), widow (S. entomelas), and canary (S. pinniger) rockfish, seasonally collected off the Pacific Northwest in 1998 and 1999, provided quantitative information on the food habits of these species during and after the 1997–98 El Niño event. Although euphausiids were the most common major prey of all three predators, gelatinous zooplankton and fishes were the most commonlyconsumed prey items during some seasonal quarters. The influence of the El Niño event was evident in the diets. Anomalous prey items, including the southern euphausiid species Nyctiphanes simplex and juveniles of Pacific whiting (Merluccius productus) frequently appeared in the diets in the spring and summer of 1998. The results of stomach contents analyses, based on 905 stomach samples from 49 trawl hauls during seven commercial fishing trips and from 56 stations during research surveys, were consistent with the timing of occurrence and the magnitude of change in biomass of some zooplankton species reportedfrom zooplankton studies in the northern California Current during the 1997–98 El Niño. Our findings indicate that the observed variations of prey groups in some rockfish dietsmay be a function of prey variability related to climate and environment changes. |
format |
article |
topic_facet |
Biology Ecology Fisheries |
author |
Lee, Yong-Woo Sampson, David B. |
author_facet |
Lee, Yong-Woo Sampson, David B. |
author_sort |
Lee, Yong-Woo |
title |
Dietary variations in three co-occurring rockfish species off the Pacific Northwest during anomalous oceanographic events in 1998 and 1999 |
title_short |
Dietary variations in three co-occurring rockfish species off the Pacific Northwest during anomalous oceanographic events in 1998 and 1999 |
title_full |
Dietary variations in three co-occurring rockfish species off the Pacific Northwest during anomalous oceanographic events in 1998 and 1999 |
title_fullStr |
Dietary variations in three co-occurring rockfish species off the Pacific Northwest during anomalous oceanographic events in 1998 and 1999 |
title_full_unstemmed |
Dietary variations in three co-occurring rockfish species off the Pacific Northwest during anomalous oceanographic events in 1998 and 1999 |
title_sort |
dietary variations in three co-occurring rockfish species off the pacific northwest during anomalous oceanographic events in 1998 and 1999 |
publishDate |
2009 |
url |
http://hdl.handle.net/1834/25430 |
work_keys_str_mv |
AT leeyongwoo dietaryvariationsinthreecooccurringrockfishspeciesoffthepacificnorthwestduringanomalousoceanographiceventsin1998and1999 AT sampsondavidb dietaryvariationsinthreecooccurringrockfishspeciesoffthepacificnorthwestduringanomalousoceanographiceventsin1998and1999 |
_version_ |
1756078028725682176 |